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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b556f4ae69d3cb7378cfc8848e8ec12e7f9cbc8f1a1055e60b3e7452f0a964b2' 
  AND token = 'srV1Urcd7te/fRsEvUJK7QpoNpSAXZdze7t3LxF3K7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}